Experimental study on flexural behavior of FRP bars recycled concrete beams

doi:10.19936/j.cnki.2096-8000.20231028.008

Abstract

Abstract: In order to study the flexural performance of FRP bars RAC (recycled aggregate concrete) beams, 8 FRP bars RAC beams were experimentally fabricated, of which the number of GFRP bars and BFRP bars RAC beams was 6 and 2, respectively. The effects of RA (recycled aggregate) replacement rate and FRP bars type on the failure mode, deflection and bearing capacity of beams were studied by four-point bending test. The test results show that: ①The cracking load and ultimate bearing capacity of the beam both decreased with the increase of RA replacement rate, and the failure mode gradually changes from the compression failure of normal section concrete to the diagonal tensile failure; ②The increase in the elastic modulus of BFRP bars increases the height of the RAC compression zone of the beam, which improves the bearing capacity of the normal section of the beam, but the bearing capacity of the oblique section increases less, so that the diagonal tensile failure of the RAC beam with BFRP bars occurs; ③The safety reserve of the bearing capacity of FRP reinforced RAC beams calculated by the specification is slightly insufficient. It is suggested that when the actual reinforcement ratio is 1~1.5 times of the equilibrium reinforcement ratio ρ_fb, the design value is 0.8 times of the calculated value of the specification; ④The calculated deflection values of GB and ACI are in good agreement with the experimental values, which can well predict the deflection value of FRP reinforced RAC beams.

Key words: FRP bars recycled aggregate concrete beams, failure mode, cracking load, load-deflection curve, ultimate bearing capacity, composites

CLC Number:

TB332

JIN Gaoming, SUN Kangcai, LIU Shengwei, BAI Chengyu. Experimental study on flexural behavior of FRP bars recycled concrete beams[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(10): 52-59.

References

[1] 吕旭滨, 于江, 秦拥军, 等. 再生混凝土梁受弯破坏过程声发射的灰色模型[J]. 科学技术与工程, 2019, 19(28): 270-275.
[2] 张海霞, 朱天泽, 黄妍. 盐腐蚀环境下内嵌FRP筋加固混凝土界面黏结性能试验研究[J]. 建筑结构学报, 2021, 42(S1): 433-441.
[3] 宋文涛, 曹宝珠, 董金爽, 等. 碳纤维增强复合材料编织网混凝土梁的试验研究[J]. 科学技术与工程, 2019, 19(26): 304-309.
[4] 魏康, 李犇, 孙峤. 玄武岩纤维改善再生混凝土抗氯离子渗透性能研究[J]. 硅酸盐通报, 2022, 41(5): 1656-1662.
[5] 徐福卫, 田斌, 徐港. 界面过渡区厚度对再生混凝土损伤性能的影响分析[J]. 材料导报, 2022, 36(4): 122-128.
[6] MUHAMMED U, KURSAT E A. A holistic assessment of the use of emerging recycled concrete aggregates after a destructive earthquake: Mechanical, economic and environmental [J]. Waste Management, 2022, 146: 53-65.
[7] JEONGHYUN K. Influence of quality of recycled aggregates on the mechanical properties of recycled aggregate concretes: An overview[J]. Construction and Building Materials, 2022, 328: 127071.
[8] ZHANG H H, XIAO J Z, TANG Y X, et al. Long-term shrinkage and mechanical properties of fully recycled aggregate concrete: Testing and modelling[J]. Cement and Concrete Composites, 2022, 130: 104527.
[9] ZHU L H, WEN T H, TIAN L. Size effects in compressive and splitting tensile strengths of polypropylene fiber recycled aggregate concrete[J]. Construction and Building Materials, 2022, 341: 127878.
[10] MOHAMMAD A, GEORGE M, NIKOS B, et al. AI-based shear capacity of FRP-reinforced concrete deep beams without stirrups[J]. Engineering Structures, 2022, 264: 114441.
[11] 曹万林, 刘亦斌, 肖建庄, 等. 配筋再生混凝土棱柱体徐变试验研究[J]. 建筑结构学报, 2020, 41(12): 141-147, 164.
[12] 韩定杰, 刘中宪, 刘华新, 等. 玄武岩纤维筋增强再生混凝土梁抗剪性能的试验研究[J]. 玻璃钢/复合材料, 2018(2): 15-20.
[13] 韩飞, 孔祥清, 鲍成成, 等. BFRP筋再生混凝土梁抗弯性能试验研究[J]. 玻璃钢/复合材料, 2017(12): 45-50.
[14] 张剑瑞, 曹家乐, 王彦鹏, 等. 超高性能混凝土加固钢筋混凝土梁抗剪性能[J]. 科学技术与工程, 2022, 22(19): 8421-8430.
[15] 张志强, 师晓权, 李志业. GFRP筋混凝土梁正截面受弯性能试验研究[J]. 西南交通大学学报, 2011, 46(5): 745-751.
[16] SHEN X Y, LI B, SHI W Z, et al. Numerical study on flexural behaviour of FRP reinforced concrete beams with compression yielding blocks[J]. Case Studies in Construction Materials, 2022, 17: e01169.
[17] SHEHAB M, HAMDY M M, ADEL E S, et al. Bond-dependent coefficient and cracking behavior of lightweight self-consolidating concrete (LWSCC) beams reinforced with glass- and basalt-FRP bars[J]. Construction and Building Materials, 2022, 329: 127130.
[18] 杜修力, 王作虎, 詹界东. 预应力CFRP筋混凝土梁受剪性能试验研究[J]. 建筑结构学报, 2011, 32(4): 80-86.
[19] 张晓亮, 屈文俊. 无腹筋混合配筋混凝土梁抗剪性能试验研究[J]. 同济大学学报(自然科学版), 2010, 38(10): 1421-1427.
[20] 徐新生, 纪涛, 郑永峰. FRP筋混凝土梁挠度的特点及计算方法[J]. 工程力学, 2009, 26(S1): 171-175.
[21] 邓宇, 张鹏, 李冰. FRP筋混凝土梁正截面承载力计算方法的研究[J]. 玻璃钢/复合材料, 2009(3): 6-7, 75.
[22] ALIREZA A, MASOUMED T, JAVAD S, et al. Prediction of the effective moment of inertia for concrete beams reinforced with FRP bars using an evolutionary algorithm[J]. Structures, 2022, 35: 684-705.
[23] HAN S W, ZHOU A, OU J P. Relationships between interfacial behavior and flexural performance of hybrid steel-FRP composite bars reinforced seawater sea-sand concrete beams[J]. Composite Structures, 2021, 277: 114672.
[24] Canadian Standards Association (CSA). Design and construction of building structures with fiber-reinforced polymers: CSA S806-12[S]. Mississauga: Canadian Standards Association, 2012.
[25] American Concrete Institute (ACI) Committee 440. Guide for the design and construction of concrete reinforced with FRP bars: ACI 440.1R-15[S]. Farmington Hills: American Concrete Institute, 2015.
[26] 纤维增强复合材料建设工程应用技术规范: GB 50608—2010[S]. 北京: 中国计划出版社, 2011.
[27] 冯鹏, 叶列平, 黄羽立, 等. 受弯构件的变形性与新的性能指标的研究[J]. 工程力学, 2005, 22(6): 28-36.